The following Little Man

The following Little Man program is supposed to add two input numbers, subtract

a third input number from the sum, and output the result, i.e.,

The following Little Man program is supposed to add two input numbers, subtract a third input number from the sum, and output the result, i.e., OUT IN1+ IN2IN3 mailbox mnemonic codenumeric code 01 02 03 04 05 06 07 08 IN STO 99 IN ADD 99 STO 99 IN SUB 99 OUT COB 901 399 901 199 399 901 299 902 What is wrong with this program? Modify the program so that it produces the correct result